Pad-adjuster.



E. F. HODGKINS.

PAD ADJUSTEB. APPLlcMloN Hugo sP.27.1915.

1,197,489. Patented Sept. 5,1916.

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EDWARD E. rIoDCKlNs, or BEVERLY, MAssAcnUSETTs, AssreNoE To NAUMKEAG BUEEING MACHINE COMPANY, or EEVEELY, MASSACHUSETTS, A CORPORATION 0E MAINE.

PAD-ADJUSTE/R. Y

Appli-cation led September 27, 19,15.

To all whom t may concern A Be it known that I, EDWARD F. HODGKINS, a citizen of the United States, residing at Beverly, in the county of Essex and State of Massachusetts, have invented certain Iinprovements in Pad-Adjusters, of which the following description, in connection with the accompanying drawings, is a specification, like reference characters on the drawings indicating like parts in the several tigures.

'Ihis invention relates to a device for adjusting a. flanged or tongued buiing pad or abrasive over on a holder and is an improvement upon the device shown in United States Letters Patent to Perry No. 541,675. In the adjusting device shown in that patent the supporting member Q'is rigid with the frame and the distance from the upper surface of said member to the under surface of the plates cl is consequently always the same. If ,the pad holders upon which the pads or covers are to be placed were all of the same thickness no disadvantage would occur; but these pad holders differ in thickness so that heretofore it has 'been necessary to provide with each adjuster a plurality of thin disks or shims which are used to build up, so to speak, the member 2 whenever a thin pad holder is encountered. In other words the device of the patent is adapted to adjust properly a pad or cover upon a holder of a given thickness but not upon a holder of less than the given thickness; and

wheneverl a thin holder is being used the shims or disks referred to above have been required.

One feature of the present invention ycomprises a device of the class referred to above in which the supporting member is yieldingly supported in the frame so that the margin of the cover which is being drawn about the holder is pressed between the yupper surface of the holder and the under surface of the plates during the 4adjusting operation. This and other features of the invention, including certain kdetails of construction and combinations of parts will be described in connection with an illustrative device and pointed out in the appended claims.

Referring now to the accompanying drawing, there is shown partly in perspective and partly in section a pad adjusting de- Specicaton of Letters Patent.

Patented Sept. 5, 1916.

Serial No. 52,893.

vice in which the present invention is embodied.

Mounted in the frame 1 is a support 3 having a stem 5 the upper portion of which is slidable in a socket in a depending portion of the frame. rEhe lower portion of the stem 5 is of reduced diameter and is surrounded by' a spring 7 which is `arranged as shown to press the support 3 upwardly at all times. Adjusting and lock nuts 9, 11 provide means for limiting the upward movement ofthe support. The support 3 is circular in outline and fits loosely in a socket in the frame, being guided in its vertical movement and held from rotation by a pin 13 which is driven into the support and slides through a suitable bore in the frame. vIn order to limit adjustably the extent of downward movement of the support 3 when a pad or abrasive cover is being adjusted upon a holder, va screw 15 is threaded through a lug on the frame and into Contact with the under side ofthe support.

lIhe means for bending the margin of the cover inwardly and drawing it over the upper surface of the holder is similar to that shown in the Perry patent. This bending means comprises a plurality of plates 17 each of which is slidable ,in a radial guide in the frame 1 and is provided with an upstanding pin 19 which extends into a cam socket 27 formed in the under side of an angularly movable ring Q1 having a handle 121 which is movable in an arc between stops 23, 24. When, therefore, the handle is moved from one extreme position to another the plates 17 are moved radially toward Ior from the center of the device. In order that the outline of the inner ends of the plates 17 may present a continuous circular curve in every position of said plates,

the adjacent corners of said plates are rabbeted and overlapped as shown.

In the drawing, a pad holder 100 with a pad or cover 200 adjusted about it are shown, the plates 17 having been moved to their innermost positions. The pad or cover 200 herein illustrated is identical with that shown in United States patent to Rogers No. 631,67 5 and comprises a Hat buifing portion, a molded marginal portion and a series of tongues extending from said marginal portion. In the operation of the device the action of the plates 17 is to bend inwardly these tongues and to draw the cover tightly about the holder, after which, while the cover is so held, a clamping nut, not shown, is screwed down on the threaded portion 25 of the stem of the holder to engage the tongues and hold the cover in position after the plates 17 have been withdrawn and the adjusting device removed. `In screwing this nut on the stem the operator eXerts a certain amount of pressure in a downward direction upon the holder, such pressure being sufii-v cient 'at times to depress the support 3 and thereby release the grip of the plates and the upper part of the holder upon the tongues. The purpose of the stop screw 15 is to prevent such release.

- The operation of the device is as follows The stop screw 15 is set in accordance with the thickness of the holder to which a cover is to be applied, the position of the stop screw being such that after the tongues have been bent over into the position shown the holder and cover will be securely held. Until the holder and cover have been forced into the position shown, however, the spring 7 maintains the support 3 slightly above the top of the stop screw. The handle 121 is swung into contact with the stop 24 whereupon the plates 17 are withdrawn. The pad holder 100 with the cover 200 upon it is placed on the support 3. The handle 121 is y then swung into the position shown thereby causing the plates to wipe the tongues inwardly into the position shown so as to adjust the cover on the holder; and during this adjusting or wiping movement the spring 7 holds the tongues tightly against the under surface of the plates 7. The operator then screws down the clamping nut (not shown) so as to grip the tongues firmly and permit the removal of the adjusting device; after which the handle 121 is swung back into contact with the stop 24 and the holder with its adjusted cover removed.

It should be noted that during the adjusting operation the plates 17 ride up over the beveled margin of the pad holder thereby forcing said holder downwardly in opposition to the force of the spring; and that the stop screw 15 prevents the possibility of the grip of the plates and support upon the pady holder and cover from being loosened when the clamping nut (not shown) is screwed into place.

The abrasive covers commonly used are made of emery cloth; and, in the process of adjusting a cover to a holder in the manner which has been described above, a small amount of emery is rubbed 0H'. In order to prevent this emery from collecting in the bearing in which the stem 5 slides, grooves 29 are formed in the frame below the support 3, and holes 31 permit the escape of the emery which collects in the grooves.

Having thus described my invention, I claim as new and desire to secure by Letters Patent of the United States:

1. Adevice for adjusting a cover on a holder comprising a frame, a support upon which the holder and its cover rest, means for bending the margin of the cover inwardly and drawing it over the upper surface of the holder to adjust said co'ver to said holder, and yielding means located between the support and the frame acting to force the support toward the bending means during the adjusting operation.

2. A device for adjusting a cover on a holder comprising a frame, a support upon 3. A device for adjusting a cover on a holder comprising a frame, a support upon which the holder and its cover rest, means for bending the margin of the cover inwardly and drawing it over the upper surface of the holder to adjust said cover to said holder, yielding means located between said support and said frame, and means whereby the normal position of said support may be adjusted.

4. A device for adjusting a cover on a holder comprising a frame having a circular socket and an upright bearing, a support upon which the holder and its cover rest located in said socket and having a stem eX- tending into said bearing, between said support and fra-me, and means for bending the margin of the cover inwardly and drawing it over the upper surface of the holder, there being formed in the lower wall of the socket below the support passageways to permit the escape of abrasive material rubbed off during the adjusting operation.

In testimony whereof I have signed my name to this specification.

EDWARD F. HODGKINS.

` Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents.

Washington, D. C.

a spring located 

